Re: How to measure time accurately.
From: Chris Friesen
Date: Tue Mar 29 2005 - 00:09:34 EST
Can any one tell me how to measure time accurately for a block of C code
in device drivers.
For example, If I want to measure the time duration of firmware download.
Most cpus have some way of getting at a counter or decrementer of
various frequencies. Usually it requires low-level hardware knowledge
and often it needs assembly code.
On ppc you'd use the mftbu/mftbl instructions, as suggested by Lee on
x86 you'd use the rdtsc instruction.
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